Aspiring celebrities about to make your first rounds on the talk show circuit, take note. Earlier this year, we cautioned you regarding the pitfalls of repeating the same anecdote word-for-word on multiple talk show appearances, using Jason Segal's penis-bearing fable as our example. Tonight, we'd like to walk through the subtle art of how to recognize what kind of stories are good for dinner parties versus those that are suitable to be told to a national television audience, showcasing Mad Men star Jon Hamm's disastrously disrespectful appearance on Jimmy Kimmel Live! on Friday night.In this clip cut together by our very own Molly McAleer, you'll see two sides of the very same story coming together and then exploding before your very eyes. Here's a quick primer. You see, Mr. Don Draper himself, Jon Hamm, appeared on the Live With Regis And Kelly show on Thursday morning. Little did he know, both Regis and his wife are huge fans of the show Mad Men . They're such big fans, in fact, that the 77-year-old Regis thought it would be fun to spend a little time after the show with Hamm, going as far as to invite him over to the Philbin's apartment. Being the good sport that he is, Hamm agreed to hang with Reege and Joy for a few hours, posing for pictures and making small talk until other obligations rescued him from what was undoubtedly an awkward situation. Up until this point, it was a win/win for all parties involved. Hamm endeared himself to a showbiz legend and Reege got to hang with an actor who likely reminds him of his 1960s glory days. (As you'll see in the clip above, Regis is still beaming four days later.) However, Hamm submarined himself by being unable to hold his tongue about how he really felt about spending time with the Philbins when he came on Kimmel's show on Friday night. Rather than save the story of Regis' wacky behavior for the afterparty in the green room of the El Capitan, he made the cardinal mistake of derisively referring to one of Hollywood's most endearing and popular fixtures as "an elfin force of nature" and a "crazy showbiz guy." Boo! Jon, we know your intentions were in the right place. You were on your friend's show, you had a great story and you just wanted to make the audience laugh. However, poking fun at a beloved institution like Regis is miles apart from poking fun at a tired old windbag like, say, Larry King. Save the barbs about how "crazy" Regis is for when you're kicking back with a few beers at your buddy Kimmel's house, versus sitting on his chair with cameras trained on you and millions thousands of people watching. If you want your career to have legs, that's a lesson you'll want to learn sooner rather than later.